docs(changelog): record #80 stack-depth CI guard (closes #37)

[hyperpolymath]

One-line documentation follow-up to the now-merged #80 (which closed #37).

Adds the #80 entry to the [Unreleased] / Fixed section of the manually-maintained CHANGELOG, in the same conventional-commit format as the existing entries (the #43 line for the same issue is already present a few lines below).

- fix(checker): self-driving stack-depth measurement + CI guard on Linux + Windows; harden survives() (closes #37) (#80)

No code change.

https://claude.ai/code/session_013JnrUmkCpMHsABRmhLVyd2

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[github-actions]

🔍 Hypatia Security Scan

Findings: 96 issues detected

Severity	Count
🔴 Critical	6
🟠 High	39
🟡 Medium	51

⚠️ Action Required: Critical security issues found!

View findings

[
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    "reason": "Issue in governance.yml",
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